In this paper a novel axial flux PM less (AF-PMLess) machine with a DC field coil is investigated. The machine’s key feature rests on a new and simple configuration, which allows the main air gap flux to be controllable. In fact AF-PMLess machine is an attempt to avoid the permanent magnets in construction and instead a dc field winding fixed to the stator to provide the desired features in machine. In this manner, air-gap flux can be controlled over a wide range with a low cost and without demagnetization risk for permanent magnet materials. In this paper a full description and operating principles of double-sided AF-PMLess machine with internal stator is explained. Then the sizing equations of AF-PMLess machine are presented and the main dimensions of the proposed machine, by means of Genetic algorithm (GA), are optimized. The design optimal sizes are obtained by calculating the torque density. Finally a three-dimensional (3-D) finite element analysis (FEA) model of a 1 kW AF-PMLess machine is developed for the validation of the analytical model. The aim of this paper is to analyze the basic equations that describe the operating conditions of proposed machine.
